Broaching machine



W. FERRIS BROAC HING MACHINE Dec. 22, 1936.

Original Filed Feb. 9, 1954 S SheetS-Sheet l INVEN R VQALTER FERRIS.

5 ATT RNEY ea. 22, 1936. w. FERRIS BROACHING MACHINE Original Filed Feb.9, 1954 8 Sheets-Sheet 2 INVENTOR 4 WALTER FERRIS.

BY W RNEY Dec. 22, 1936. w. FERRIS BRQACHING MACHINE Original Filed Feb.9, 1954 8 Sheets-Sheet 5 INVENTOR 5'0 VVALTEH FER'R'IS.

ATTORNEY Dec. 22, 1936. w. FERRIS BROACHING MACHINE 8 sheei's-sheet 4Original Filed Feb. 9, 1934 2 5 em 8 0 n: n m w 7- INVENTOR WALTERF'EHR'IS- BY WfRNEY Dec. 22, 1936. w. FERRIS BROACHING MACHINE OriginalFiled Feb. 9, 1934 8 Sheets-Sheet 5 INVENTOR WALTER F EHFHS.

BY WERNEY Dec. 22, 1936. w FERR|$ 2,065,219

BRO'ACHING MACHINE Original Filed Feb. 9, 1934 8 Sheets-Sheet '7 ThhlllnINVENTOR VVALTER FERH'I'S.

TTO EY Patented Dec. 22, 1936 UNITED STATES PATENT OFFICE BROACHINGMACHINE Walter Ferris, Milwaukee, Wis., assignor to The OiIgear Company,Milwaukee, Wis., a corporation of Wisconsin 30 Claims.

This application is a continuation of application Serial No. 710,396,filed February 9, 1934, as to matters common to both applications.

The invention relates to breaching machines of the type in which abreaching tool is retained in a stationary position and a reciprocablework carrier moves the work along the tool during the breachingoperation, such as the breaching machine described and claimed in myprior Patent The machine disclosed in the above patent is adapted tobreach interior surfaces, and the work is ordinarily centered by itscontact with the breaching tool.

The present invention has as an object to provide a machine of thischaracter which is capable of breaching exterior surfaces.

A breaching machine has a work carrier and a tool carrier one of whichis fixed to the frame of the machine and the other of which slides uponthe frame to provide relative movement between the work and the tool inorder to enable the tool to breach the work. During the breaching of anexterior surface, the work exerts a thrust against the tool at rightangles to the cut and tends to cause relative displacement of the tooland the work.

Anotherobjectof the present invention is to' provide a surface breachingmachine with means for positively preventing any such relativedisplacement.

Another object is to provide a surface broaching machine in which thework is retained in position to be breached during the cutting stroke ofthe machine and released during the return stroke.

Another object is to provide a surface breaching machine having areciprocable work support upon which the work is advanced into positionto be engaged by the tool during the cutting stroke of the work supportand then retracted from that position in order to clear the tool duringthe return stroke of the work support.

Another object is to provide a breaching machine of this character whichis operated hydraulically.

Another object is to provide a surface broaching machine of thischaracter which is automatic in operation.

Another object is to provide a surface breaching machine which ispositive and precise in operation.

Other objects and advantages will be apparent from the descriptionhereinafter given of breachmg machines in which the invention isembodied,

According to the invention in its general aspect, the breaching machineis provided with means for retaining the breaching tool in a stationaryposition, a work support for carrying the work to be breached, powermeans for reciprocating 5 thework support longitudinally of thebreaching tool, and means carried by the work support for preventing anyrelative displacement of the breaching tool and the work during thebreaching operation. 10

According to the invention in another aspect, the work is automaticallyadvanced into position to be breached and is secured in that positionwhen the work support is at or near one end of its stroke andautomatically released or retracted 15 from that position when the worksupport is at or near the other end of its stroke.

The invention is exemplified by the breaching machines illustratedsomewhat schematically in the accompanying drawings in which the views20 are as follows:

Fig. 1 is a front view of a machine which has its work holder operatedby a hydraulic motor arranged upon the base of the machine.

Fig. 2 is an elevation of the right side of the 25 machine shown in Fig.1.

Fig. 3 is a top plan viewthereof.

Fig. 4 is a sectional plan view taken on the irregular line 44 of Fig.1.

Fig. 5 is a detail view taken in the plane of the 30 line 5--5 of Fig. 4and showing mechanism for moving the work into and out of position to bebreached.

Fig. 6 is a detail view showing the mechanism which operates themechanism shown in Fig. 5, 35 the view being taken substantially on theline 6-6 of Figs 2 and 7.

Fig. '7 is a sectional plan view taken on the line 1-1 of Fig. 6.

Fig. 8 is a section taken on the line 8-8 of 40 Fig. 5.

Fig. 9 is a diagram of the hydraulic circuit and shows the reversing andthe control valves in the positions occupied when the machine is idle.

Fig. 10 is a schematic drawing showing the re- 45 versing and controlvalves in the positions occupied when the machine is making a cuttingstroke.

Fig. 11 is a view similar to Fig. 10 but showing the reversing andcontrol valves in the positions occupied when the machine is making areturn 5 stroke.

Fig. 12 is a side view of a breaching machine which has its work holderoperated by a hydraulic motor arranged upon the movable work support.

Fig. 13 is a plan view taken in the plane of the 55 line l3-l3 of Fig.12 and showing details of the work holder.

Fig. 14 is a section taken on the line I4l4 of Fig. 13.

Fig. 15 is a front view of a broaching machine which has a mechanicallyoperated work holder. Fig. 16 is a top plan view of the work holdershown in Fig. 17. r

Fig. 17 is a central section through the work holder shown in Fig. 16and employed on the machine shown in Fig. 15, the view being takensubstantially on a line lll'l of Figs. 15 and 16.

Fig. 18 is a section taken on the line I8I8 Of Fig. 17.

Fig. 19 is a view similar to Fig. 1'7 but showing a modified form ofwork holder.

Fig. 20 is a front elevation of another surface broaching machine inwhich the invention is embodied.

Fig. 21 is in part a vertical section and in part a side view of themachine shown in Fig. 20, the view being taken along the irregular line2l2l of Fig. 22.

- Fig. 22 is asectional plan view taken on the line 2222 of Fig. 20.

For the purpose of illustration, the broaching machine is shown as beingof the same general construction as the machine shown in Patent No.1,901,500 referred to above. In practice, however, this type of machinehas its frame and work support made of structural plates and shapeswelded or otherwise fastened together and its hydraulic a motorsarranged in reverse position with the cylinders thereof fastened to thelower part of the frame so that the motors push the work support upwardinstead of pulling it upward as shown, but the function and operatingcharacteristics of the machine are the same.

Figs. 1 to 19 As shown, the broaching machine has its mechanism carriedby a frame consisting primarily of a base I which is shaped to provide areceptacle to catch chips and liquid, a bottom girder 2 arranged uponthe base, two front columns 3 and 4 and a rear column 5 supported by thegirder 2, and a top girder 6 arranged upon the upper ends of the columnsand secured in place by three tension rods 1 each of which extendsthrough a column and the bottom girder and is fastened to the base as bybeing threaded therein.

The rear column 5 carries upon the front facethereof a broach support 8which has the upper end of a surface broaching tool 9 removably securedtherein to restrain it from lateral movement. a

The broaching tool 9 is removably secured at its lower end in a drawhead 10 as by means of a key I I inserted through alined slots formed inthe draw head and in the lower end of the broaching tool in thecustomary manner.

The draw head In is rigidly secured to the bottom girder 2 and restrainsthe broaching tool from movement in any direction. v

The broachingtool is adapted to operate upon work carried by a work'support which is reciprocated vertically to move the work along thebroaching tool to be broached thereby.

The work support consists primarily of a horizontal bottom plate l2,avertical side wall l3 extending alongthe rear edge of the plate l2 andalong the greater part of each of the two lateral sides thereof, ahorizontal lug l4 extending from each of its lateral sides in the planeof the bottom plate l2, and a vertical rib l5 connecting the rear edgeof each lug I4 to the side wall l3, all of which are rigidly securedtogether or formed integral with each other.

The bottom plate l2 has an opening it formed therein to permit thebroaching tool 9 to extend therethrough, and the wall I 3 has attachedto the front face thereof in alinement with the opening If; an abutmentH which engages the tool 9 upon the rear face thereof and prevents itfrom being deflected by the thrust of the work during the broachingoperation.

The broaching tool 9 may be removed from the machine when the worksupport is in its lower position by removing the cap from the broachsupport 8, withdrawing the key H, lifting the tool out of the draw headI0 and then moving it upward and forward.

The work support is guided for vertical recip rocation by the frontcolumns 3 and 4. As shown, it is provided .upon each of its, lateralsides with a guide 3 which is rigidly secured to or formed integral withthe side wall l3 and fitted in a guideway 19 (Fig. 4) formed in theadjacent column.

The work support may be reciprocated by two hydraulic motors 20 each ofwhich is arranged behind one of the front columns and has its cylinderconnected at the upper end thereof to the top girder 6 by bolts 2|. Eachof the motors 20 has a piston 22 fitted in its cylinder and connected bya piston rod 23 to a lug [4 on the work support.

Liquid for operating the motors 20 is supplied by a pump 24 which isarranged in any suitable place, as upon a bracket 25 carried by the rearcolumn 5, and the pump should be adjustable to vary its delivery inorder that the machine may be operated at various broaching speeds. Apump which maybe employed is shown in Patent No.1,901,501. This pump isprovided with a handwheel 26 for adjusting its displacement and it isdriven by an electric motor 21 directly connected thereto.

The delivery of liquid from the pump 24 to the motors 20 is controlledby a hydraulically operated reversing valve 28 which is shown mountedupon the casing of the pump 24. Valve 28 is controlled by a controlvalve 29 carried by the column 4 upon the front thereof.

The flow of liquid through the valve 29 is controlled by its plunger 30(Fig. 9) which is provided at its upper end with a stem 3| and at itslower end with a stem 32 having an operating handle 33 upon its lowerend and an abutment 34 fixed thereon intermediate its ends.

The plunger 30 is urged upward by a helical compression spring 35 whichencircles the stem 3| between a collar 36 fixed thereon and the end ofthe valve casing.

When the machine is idle, the plunger 30 is retained in its neutralposition, as shown inFigs. 1 and 9, by an arm 31 which abuts the upperend of the, valve stem 3| and is carried by a control rod 38 having anarm 39 fixed upon its lower end in the path of a stop 40 carried by thework support in an adjusted position upon the front end of the wall 13.

The control rod 38 is arranged in an upper guide 4| and a lower guide 42carried by the column 4, and it is supported therein by a helicalcompression spring 43 which rests upon the guide 42.and abuts a collar44 fixed upon the rod 38.

To start the machine, the valve plunger 30 is moved downward manually tothe position shown 7 in Fig. 10 in which position it is held by a bellcrank lever 45 pivoted upon the casing of the valve 29.

The depending arm of the lever 45 is notched to engage the abutment 34when the plunger 30 is moved toits Fig. 10 position, and it is urgedinto engagement with the abutment 34 by a helical compression spring 46arranged between the horizontal arm of the bell crank lever 45 and a lug41 carried by the casing of valve 29.

When the work support approaches the upper limit of its movement, a stop48 fixed in adjusted position upon the end of wall l3 engages thehorizontal arm of the bell crank lever 45 and swings the depending armthereof out of engagement with the abutment 34 to permit the spring 35to move the plunger 3 'of the control valve 29 upward to its Fig. 11position and thereby ca'i'ise reversal of the machine.

When the work support approaches the lower limit of its movement, thestop 40 engages the arm 39 and moves the control rod 38 downward,

thereby causing the arm 31 to depress the valve connected to thedischarge pipe 50 of an auxiliary pump which draws liquid from areservoir 52 and discharges it into the discharge pipe 58 for operatingthe reversing valve 28 and also for keeping the circuit flooded tocompensate for leakage losses and for variations in the volumetriccapacity of the circuit due to the displacement of the piston rods 23.

The auxiliary pump 5|- is ordinarily driven in unison with the pump 24and arranged in the same casing, and its outlet is connected to theintake channel 53 of the-pump 24. Liquid delivered by the pump 5| inexcess of requirements is discharged into the reservoir 52 through a lowpressure relief valve 54, and the pressure created by thepump 24 islimited by a high pressure relief valve 55 which is connected to thedischarge channel 56 of the pump 24 and discharges into the reservoir52, all as disclosed in the patent referred to above.

The control valve 29 has two distributing ports 51 and 58 formed in itscasing upon opposite sides of the port 49 and both ends of its casingconnected to a drain pipe 59 which discharges into the reservoir 52.

The ports 51 and 58 are connected, respectively, by two pipes 60 and 6|to two pressure chambers 62 and 63 arranged at opposite ends of thereversing valve 28. a

The chambers 62 and 63 are larger in diameter than the bore of thereversing valve 28, and each contains a washer '64 which is urged inwardby a helical compression spring 65 arranged between it and the outer endof the chamber.

The plunger 30 of the control valve 29 controls the flow of liquid fromthe auxiliary pump 5| to the chambers 62 and 63 and, when it is in itsneutral position as shown in Fig. 9, it blocks communication between theadmission port :49 and the distributing ports 51 and 58 so that both ofthe chambers 62 and 63 are closed to the auxiliary pump 5| and open tothe drain pipe 59.

In this position of the control valve plunger 36, each washer- 64 isurged by its spring 65 against, or substantially against, the end pistonof a valve plunger 66 which controls the flow of liquid through thecasing of the reversing valve 28 and has a stop 61'arranged upon each ofits ends to limit its movement in each direction.

When the control valve plunger 39 is moved to its advance position asshown in Fig. 10, liquid from the pump 5| may enter the chamber 63 andmove the plunger 66 to the right to the position determined by the stop61 on the right end thereof, liquid being exhausted from the chamber 62through the pipe 69 and the valve 29 into the drain pipe 59.

When the control valve plunger 29 is moved to its return position, asshown in Fig. 11, the flow of liquid to and from the chambers 62 and 63and the movement of the valve plunger 66 are reversed.

The reversing valve plunger 66 controls the flow of liquid through thecasing of the valve 28 which has two return ports 68 and 69 formedtherein and spaced from each other, two distributing ports and 1|formed-therein between the two return ports, and an admission port 12formed therein between the two distributing ports.

The variable displacement pump 24 has its discharge channel 56 connectedto the admission port 12 and its return channel 53 connected to both ofthe return ports 68 and 69. Both of the motors 20 have the upper endsthereof connected to the port 10 by a pipe 13 and the lower ends thereofconnected through a pipe 14, a low pressure resistance valve and a pipe16 to the port 1| Liquid cannot flow through the resistance valve 15from the pipe 14 to the pipe 16 but it can flow therethrough in theopposite direction after the pressure in the pipe 16 has reached 'apredeter mined value, for instance 100 lb. per sq. in.

The pipe 14 is also connected to one end of a pipe 11 through a lowpressure resistance valve 18 which prevents liquid from flowing from thepipe 11 to the pipe 14 but permits it to flow in the opposite directionafter the pressure in the pipe 14 has reached a predetermined value, forinstance 100 lb. per sq. in.

The pipe 11 has its other end connected intermediate the ends of a pipe19 having one of its ends connected to the pipe 16 intermediate the endsthereof and its other end connected to the head end of the cylinder of aclamping motor 88 which has its gland end connected by a pipe 8| to thepipe 13 intermediate the ends thereof.

The clamping motor 88, which is employed for moving the work intoposition to be broached, has a piston 82 fitted in its cylinder andprovided with a rod 83.

The resistance valve 15 is employed to cause the clamping motor to beoperated to advance the work into position to be broached before thework support is raised, andthe resistance-valve 18 is employed to causethe clamping motor to be operated to retract the work out of broachingposition before the work support is lowered.

The clamping motor 89 may be arranged in a stationary position andmechanically connected to clamping mechanism arranged upon the worksupport, as shown in Figs. 1 to 8, or it may be arranged upon the worksupport and connected direct to the clamping mechanism as shown in Figs.12 to 14.

If the clamping mechanism is to be operated mechanically, as shown inFigs. 15 to 18, the clamping motor 88, the resistance valves I5 and I8and the pipes 'I'I, I9, and 8| are omitted and the pipe I8 connecteddirect to the pipe 14-.

Figs. 1-11 The broaching machine shown in these figures has a clampingmechanism or work holder arranged upon the work support and operatedthrough intervening mechanism by the motor 88 which is shownarrangedupon the bottom girder 2 in a stationary position.

- The work holder is provided with a horizontal base plate 84 which isfixed to the bottom plate I2 of the work support in a stationaryposition and has a slide 85 arranged thereon and provided along each ofits lateral sides with a guide or The base plate 84 has two undercutguide bars 81 removably attached thereto along its opposite sides andoverlapping the gibs 88' to restrain the slide 85 from lateral or upwardmovement.

The slide 85 is provided at its front end with a vertical flange 88 andat its rear end with two stops 89 which extend rearward upon each sideof the tool 9'and limit the rearward movement of the slide 85 byengaging the abutment II.

The work holder is shown adapted to move a piece of work 98, such as aconnecting rod for an internal combustion engine, into and out ofposition to be broached by the tool 9.

The connecting rod 98 is fastened in position by a pin 9| fixed in theslide .85 and extending through the piston pin bearing of the rod 98which may be further secured in position by a clamp 92.

The slide 85 is reciprocated by an eyebolt 93 which is fastened to theflange 88 and has a bifurcated head in which one end of a link 94 ispivoted upon a pin 95.

The link 94 has its other end bifurcated and pivoted by a pin 98 upon alever 91 which is splined upon a vertical shaft 98 and has a lower hub99 and an upper hub I88 journaled, respectively, in the base plate 84and in a bearing plate |8| attached to and supported from the base plate84 by means ofv a vertical flange I82.

The lever 91 may be splined to the shaft 98 by a key I83 which is fixedto the lever 91 and fitted in an elongated keyway I84 formed in theshaft 98.

The upper end of the shaft 98 is journaled in a bearing I85 carried by astrut I88 which is fastened-at its ends to the columns 3 and 4'.

The shaft 98 has its lower end provided with a pinion I81 and journaledin a bearing I88 which is attached to the bottom girder 2 and has a rackI89 fitted therein in mesh with the pinion I81 and adapted to bereciprocated transversely of the shaft 98.

The rack I89 is attached to piston rod 83 of the motor 88 and itsmovement in one or both directions may be limited by one or more stopcollars 8 arranged in-adjusted positions upon the rod 83 to abut eitherthe bearing I88 or the endof the motor 88 or both.

Preferably, the eyebolt 93 is so adjusted in the flange 88 that the link94 and the lever 91 will be in axial alinement with it when the work 98is in proper position to be broached When so adjusted, the shaft 98 isrelieved of any sub- I stantial amount of torque during the broachingthe lever 91 to the base plate 84 and the hearing plate |8|.-

The work 98 may be stopped in theproper broaching position either byproviding stops 89 of the proper length or by adjusting the stop collar8 to bear against the end of the bearing I88 when the work is in theproper positionto be broached. In either case, each piece of work willbe accurately broached to the proper size.

Assuming that the work holder is properly adjusted and a piece of workfastened thereon, that the'pumps 24 and 5| arerunning and that the worksupport is in its lower position as shown in the drawings, the machinewill operate as follows:

When thehandle 33 is drawn downward to its limit, the spring 48 willswing the bell crank lever 45 and cause the notch in the depending armthereof to engage the abutment 34 and retain the control valve plunger38 in the position shown in Fig. 10. g

Liquid from theauxiliary pump 5| may now' flow through the controlvalve29 and the pipe 8| tothe chamber 83 and move the reversing valve plunger88 toward the right until the stop 81 engages the end of the chamber 82,as shown in Fig. 10, liquid being exhausted from the chamber 82 throughthe pipe 88 and the control valve 29 into the drain pipe 59.

Liquid from the pump 24 may now flow through the channel 58, the valve28, and the pipes I8 and I9 into the head end of the motor 88 andadvance its piston 82, liquid being exhausted from the motor 88 throughthe pipes 8| and I3 and the valve 28 into the return channel 53. Theresistance valve I5 prevents the liquid from flowing into the pipe I4until the pressure in the pipe I8 reaches a predetermined value.

Advancing the piston 82 causes the rack I89 to rotate the pinion I8Iand,the' shaft 98 and thereby swing the lever 91 to move the work into athe pistons 22 and the work support, thereby pass:-

ing the work along the face of-the tool 9 to be broached thereby. Liquidis exhausted from the upper ends of the finotors 28 through the pipe I3and the valve 28 into the return channel 53.

During the broaching operation, the work exerts a thrust against thetool at-right angles to the direction of the out. If the tool should besupported at its ends only, it would be deflected by the thrust of thework. If the tool and the work were carried, respectively, by tworelatively movable parts of the machine and the tool should be supportedopposite its working partsolely by the machine part to which it isfastened as is the general practice, the thrust of the work would causerelative displacement of the two parts of the machineand, consequently,relative displacement of the tool and the work due to yielding of themachine parts. In either case, the machine could not perform accuratework.

The present invention overcomes this objectionable feature and enablesthe-machine to perform accurate work by providing means whereby the'worksupport itself takes the thrust of the work. In the embodiments shown inFigs. 1

60 its downward movement, the stop 40 engages the to 19, the abutment II slides along the back of the tool-9 and remains in firm contacttherewith so that the thrust of the work is transmitted through the tool9 to the abutment II which is a part of the work support and isimmovable relative thereto. Consequently, neither deflection of the toolnor yielding of machine parts is caused by the thrust of the work.

As the work support starts upward, the stop 40 moves out of contact withthe arm 39 and permits the spring 43 to raise-the control rod 38 andthereby raise the arm 31 out of the way of the valve stem 3I when it ismoved upward by the spring 35.

The work support continues to move upward until the stop 48 engages thehorizontal arm of the bell crank lever 45 and swings the depending armthereof out of engagement with the abutment 34, and then the spring 35raises the control valve plunger 30 to the position shown in Fig. 11.

Liquid from the auxiliary pump 5I may then flow through the'pipe 50, thecontrol valve 29 and the pipe 60 to the chamber 62 and shift thereversing valve plunger 68 to the left until'the stop 61 abuts the endof the chamber 63, as shown in Fig. 11.

Liquid from the pump 24 may now flow through the channel 56, the valve28 and the pipes 13 and 8I into the gland end of the motor 80 andretract its piston 82, liquid being exhausted from the-head end of themotor 80 through the pipes I9 and I6 and the valve 28 into the returnchannel 53, and the resistance valve I8 preventing liquid from escapingfrom the pipe 14 into the pipe I6 and thereby preventing the worksupport from descending until pump pressure reaches 'a predeterminedvalue.

Retracting the piston 82 causes the rack I09 to rotate the pinion I01and the shaft 98 and thereby swing the lever 91 to retract the workholder so that the work will not engage the tool 9 during the downwardmovement of the work support.

When the work is fully retracted, the motor 80 is stalled either by itspiston 82 engaging the head end of its cylinder or by the stop collarIIO engaging the gland end thereof.

Stalling the motor 80 causes the pump pressure to rise sufliciently toovercome the resistance of the valve I8 and permit liquid tobe exhaustedfrom the lower ends of the motors 20.

, Then liquid from the pump 24 flows into the upper ends of the motors20 and moves the pistons 22 thereof and the work support downward,liquid being exhausted from the lower ends of the motors through thepipe 14, the resistance valve I8, the pipes 11, I9 and I6 and the valve28 into the return channel 53.

As the work support approaches the limit of arm 39 and moves the controlrod 38 and the arm 31 downward, and the arm 31 engages the valve stem 3|and moves the plunger 30 of the control valve 29 downward to its centralor neutral position, as shown in Fig. 9. 7

Moving the control valve plunger to its neutral position closescommunication between the admission port 49 and the distributing ports51 and 58 and opens both of the chambers 62 and 03 to the drain pipe 59,thereby permitting the spring 65 in the chamber 63 to move the reversingvalve plunger 66 to its central or neutral position.

With the plunger 68 in its neutral position,

. the output of the pump 24 is bypassed from the discharge channel 56through the reversing valve 28 to the return channel 53 and the machinecomes to rest.

. Figs. 12-14 -on the work support and connecting it direct to the workholder.

Consequently, the machine has not been illustrated in detail and theparts shown which are the same as the corresponding parts of the machineshown in Figs. 1 to 11 have been indicated by the same referencenumerals.

In this form of the invention, the motor 80 is arranged upon the baseplate 84 in a stationary position and has its piston rod connecteddirect to the flange 88 of the slide 85 as by means of nuts threadedthereon.

The motor 80, when energized, moves the work into broaching position byacting directly upon the slide 85, the forward movement of the workbeing limited by the stops 89 engaging the abutment I1 or by the motor80 being properly adjusted upon the base plate 84 and its piston 82stalling against the end of its cylinder.

Since the motor 80 moves with the work support, it is necessary toconnect it into the circuit through flexible connections, such as byslide pipes, by pipes having flexible joints therein, or by flexiblepipes. As shown, the pipes 19 and 8| (Fig. 9) have been replaced,respectively, by flexible pipes 19 and M (Fig. 12).

The machine operates in exactly the same manner as the machine shown inFigs. 1 to 11 except that the motor 80 acts direct upon the work holder.Consequently, a description of the operation will not be given.

Figs. 1 5-1 9 The work holder is provided with a base plate I20 which isarranged upon the bottom plate I2 of the work support in a stationaryposition and has a slide I2I arranged thereon between two guide bars I22which are fastened to the base plate I20 upon opposite sides of theslide I2I.

The guide bars I22 are undercut and overlap suitable gibs formed on theslide I2I which is thus restrained from vertical or lateral movement butis permitted to reciprocate freely toward and from the tool 9.

The front part of the slide I2I is considerably thicker than the rearpart thereof and fitted between the base plate I20 and a bearing plateI23 arranged parallel to the base plate I20 and rigidly connectedthereto by a vertical flange I24.

The rear part of the slide I2I is adapted to have a piece of work I25secured thereon as by means of a clamp bar I26 connected to the slide bya clamping bolt I21 and having its front end arranged upon the work andits rear end The work I25 is accurately positioned upon the slide by aspacer I28 arranged between it and a shoulder I29 formed on the slidebetween the front and the rear parts thereof.

The slide I2I may be moved toward the tool 9 by a wedge-bar I30 whichextends therethrough and is fitted in an opening I3I formed therein.

The upper and lower end portions of the wedge-bar I30 are provided withparallel faces and fitted in the base plate I20 and in the bearing plateI23 to reciprocate therein.

In order that the tool holder may be readily assembled, the slide I2I isdivided along the opening I3I into two .parts which are firmly connectedto each other in any suitable manner, as by means of bolts.

The wedge-bar is provided upon its rear edge intermediate its. ends withan inclined camface I32 which engages a complementary face formed in thewall of the opening. I3I.

These faces extend downward and rearward so that, when the wedge-bar ismoved upward relative to the work support, the slide I2I will be movedrearward toward the tool 9.

The front edge of the wedge-bar may be provided intermediate its endswith an inclined cam face I33 which is parallel-to the face I32 and incontact with a complementary face formed in the slide I2I, as shown inFig. 1'7, or it may be shaped to remain out of contact with the slide asshown in Fig. 19 in which the front edge of the wedge-bar I30 is shownas being straight and spaced from the front Wall of the opening I3I inthe slide I2I When the wedge-bar I30 or I30 is moved upward relative tothe work support, it moves the slide I2I rearward toward the tool 9.When the wedge-bar I30 (Fig. 17) is moved downward relative to the worksupport, it moves the slide I2I forward away from the tool 9. When thewedge-bar I30 (Fig. 19) is moved downward relative to the work support,it releases the slide I2I so that the work carried thereby is not heldin contact with the tool 9 during the downward movement of the worksupport.

In order that the wedge-bar may'move successive pieces of work intoexactly the same position, the slide I 2| may be provided with two stops89 which engage the abutment I1 and limit the rearward movement of theslide.

The wedge-bar is operated in one direction or the other by engaging anadjustable stationary abutment I34 or I35 near each end of the move-.ment of the work support.

The abutment I34 is shown as a rod threaded through a strut I36 whichhas its ends fastened to the columns 3 and 4 above the upper limit ofthe work support movement.

The abutment I35 is shown as a threaded rod which extends through thebottom girder 2 and is supported by a heavy helical spring I31 arrangedbetween the girder 2 and a nut I38 threaded upon the rod.

When the work support approaches the'lower limit of its movement, thelower end of the wedge-bar I30 engages the abutment I35 and is heldstationary thereby. As the work support continues to descend, the camface I32 moves the slide I2I rearward until the stops 89 engage theabutment I1 and then the wedge-bar descends a short distance with thework support and compresses the spring I31.

At approximately the time that the stops 89 engage the abutment II, thestop 40 engages the arm 39 and then a slight further movement of thework support causes the control valve, 29 to be operated to stop themachine, the spring I3I being provided to insure that the slide I2I isin its operative position before the valve 29 is operated.

When the work support moves upward, the wedge-bar I30 is prevented frommoving downward out of its clamping position by a spring detent I39which is arranged in the bearing plate I23 and engages a recess I40formed in the wedge-bar.

As the work support approaches the upper limit of its movement, theupper end of the wedge-bar I30 engages the stop I34 which preventsfurther upward movement thereof and permits the work support to move theslide along the wedge-bar, thereby forcing the detent I39 out of therecess I40 and relieving the pressure between the slide and the cam faceI32 on the wedge-ban.

If the wedge-bar is of the type shown in Fig. 17, the cam face I33 willretract the slide and the work during continued upward movement of thework support.

If the wedge-bar is of the type shown in Fig. 19, the cam face I32 willbe retracted out of contact with the slide during continued upwardmovement of the work support so that, when the work support descends,the work may be pushed back by any obstruction such as chips clinging tothe teeth of the tool.

Just after the wedge-bar engages the abutment I34, the stop 48 engagesthe bell crank lever 45 and disengages. it from the abutment 34 topermit the spring 35 to operate the control valve 29 which causes thereversing valve 28 to be operated and the work support to descend.

During descent of the work support, the wedgebar is prevented fromdropping below a predetermined point by the detent I39 engaging a recessI4I formed in the wedge-bar.

The operation of the machine is obvious from the foregoing descriptionsince the work support is reciprocated and controlled in exactly thesame manner as in the machine shown in Figs.

1 to 11 and previously described.

Figaro to 22 The machine shown in these figures differs primarily fromthe machine shown in ,Fig. 1 in that the broaching tool is made insections and bolted or otherwise fastened throughout its length to theframe, and the Work support has the rear part thereof bifurcated andextended behind and into contact with that part of the machine to whichthe broaching tool is fastened in order that the thrust of the work maybe taken by the work support. Otherwise the machine is similar to themachine shown in Fig. 1 and like parts have been indicated by likereference numerals.

As shown, the machine has its mechanism carried by a frame consistingprimarily of a base I, two front colmns 3 and 4 and a rear column 205which are supported upon the base I, and a top girder 206 which isarranged upon the upper end of all three columns. The girder 206 issecured in position at its front by two tension rods I. each of whichextends through the girder 206 and through a front column rnd isthreaded into the base I, and at its rear by being bolted to the upperend of the rear column 205 the other end of which is bolted to the baseI. a

The rear column 205 is shown as a modified H section having a frontflange 208 which functions as a tool support and has a sectional surfacebroaching tool 209 rigidly but removably secured to its front face as bybeing bolted thereto.

The work to be broached is carried by a work support 2 which consistsprimarily of a fiat bottom plate 2 l2, two marginal side walls 2l3extending along opposite sides of the bottom plate and across thegreater part of the rear edge thereof, a lifting lug 2l4 extending fromeach of its lateral sides, a rib 2l5 arranged upon the underface thereofand extending across the bottom plate 2l2 and the lugs 2l4 to'stifl'enthe same, and a guide 2l6 arranged upon the outer face of each marginalwall 2l3 near the front end thereof to guide the work support forvertical reciprocation, all of which are formed integral with each otheror rigidly secured together as by welding. Each guide 2|0 is fitted forreciprocation in a guideway 2l'l one of which is formed in the innerface of each of the front columns 3 and 4.

The bottom plate l2 has an opening 2 l8 formed therein and extendingforward from the rear edge thereof to admit the fiange or tool support208 and the broaching tool 209. The adjacent ends of the marginal walls2l3 extend behind the flange 208 and may be arranged to slide- The worksupport 2l2 is reciprocated by two hydraulic motors 20 each of which hasits cylinder fastened at the upper end thereof to the top girder 206 andits piston rod 23' connected toa lug H4. The hydraulic motors 20 aredriven by liquid supplied by a pump 24 which is carried by a bracket 225fastened to the rear column 205. The hydraulic circuit and the controlmechanism are the same as in the machine shown in Fig. 1 and the partsthereof shown have been indicated by the same reference numeralspreviously employed but no further description thereof is deemednecessary.

The machine may be provided with any suitable type of work holder but,for the purpose of illustration, it is shown provided with a work holderwhich is exactly the same as the work holder shown in Figs. 15 to 18except that, instead of the stops 89 the slide I2! is provided with twoangular stops 289 each of which is adapted to' engage an abutment 226fixed to the bottom plate 2l2 alongside the opening 2l8 and shown asabutting the rear part of the marginal Wall 2l3. The other parts of thework holder have been indicated by the same reference numerals and nofurther description thereof will be given.

The wedge-bar I30 of the work holder-is shifted near the top of the worksupport movement by.

an abutment 234 and near the bottom of the work support movement by anabutment 235. The abutment 234 is shown as a threaded stud fixed inadjusted position in a strut 236 which extends across the front of themachine and has its end fastened to the front columns 3 and 4. Theabutment 235 is shown as being a threaded rod supported by a helicalcompression spring 231 which encircles it between a nut 238 threadedthereon and a strut 239 which has its ends fastened to the front columns3 and 4 and through which the abutment 235 extends.

The work holder operates in the manner previously described to force thestops 289 firmly against the abutments 226, and thereby hold the workI25 in position to be broached during upward movement of the worksupport, and to retract the work out of broaching position before thework support starts downward.

The machine operates and is controlled in the manner previouslydescribed. During the broaching operation. the work I25 exerts a thrustagainst the tool 209 transverse to the cut or at right angles to thedirection of support movement and tends to cause relative displacementof the tool and the work. This thrust, however, is transmitted throughthe tool 209, the tool support 208 and the wear plates 2 l9 and 220, ifany, to the marginal walls 2l3. The thrust of the work is thus taken bysubstantially integral parts of the work support and no relativedisplacement of the tool and the work can occur, thereby enabli g themachine to perform accurate work and to perform at high speed work whichformerly had to be done at slow speed on milling machines in order toattain the necessary accuracy.

The invention herein set forth is susceptible of various modificationsand adaptations without departing from the scope thereof as hereafter.claimed.

The invention is hereby claimed as follows:

1. .A surface broaching machine, comprising means for retaining abroaching tool in a stationary position, a movable work support forcarrying the work to be broached by said tool during movement of saidsupport in one direction, power means for reciprocating said support-longitudinally of said tool, means for retaining a piece of work uponsaid support and fixing It against movement relative thereto duringbroaching, said work when being broached exerting a thrust against saidtool transverse to the direction of support movement and thereby.

tending to cause relative displacement of said tool andsaid support, andmeans carried by said support for taking said thrust to thereby preventsaid relative displacement.

2. A surface broaching machine, comprising means for retaining abroaching tool in a stationary position, a movable work support forcarrying the work to bebroached by said tool during movement of saidsupport in one direction, power means for reciprocating said supportlongitudinally of said tool, means for retaining a piece of work uponsaid support and fixing it against movement relative thereto duringbroaching, said work when being broached exerting a thrust against theface of said tool transverse to the direction of support movement andthereby tending to cause relative displace ment of said tool and saidsupport, and abutment means carried by said support and reacting againstthe back of said tool for taking said thrust to thereby prevent saidrelative displacement. p

3. A surface breaching machine, comprising means for retaining abroaching tool in a stationary position, a movable work support, powermeans for reciprocating said support longitudi- 75 tool during movementof said support in onedirection, means carried by said support forproviding at a point substantially opposite the working part of saidtool a reaction to the thrust of the work against said tool to therebyprevent any relative movement between said support and said tool in adirection at right angles to the direction of support movement, andmeans for operating said retaining means to release said work frompositive engagement with said tool during movement of said support inthe opposite direction.

4. A surface broaching machine, comprising means for retaining abroaching tool in a stationary position, a movable work support, powermeans for reciprocating said support longitudinally of said tool, meansfor retaining work upon said support in position to be broached by saidtool during movement ofsaid support in 'one direction, and means carriedby said support for providing at a point substantially opposite theworking part of said tool a reaction to the thrust of the work againstsaid tool to thereby prevent any relative movement between said supportand said tool in a direction at right angles to the direction of supportmovement, and means responsive to said support approaching the limit ofits movement in said direction. for operating said retaining means torelease said work from positive engagement with said tool duringmovement of said support in the opposite direction.

5. A surface broaching machine, comprising means for retaining abroaching tool in a stationary position, a movable work support, powermeans forreciprocating said support longitudinally of said tool, meansfor retaining work upon said support in position to be broached by saidtool during movement of said support in one direction, means carried bysaid support for providing at a point substantially opposite the workingpart of said tool a reaction to the thrust of the work against said toolto thereby prevent any relative movement between saidsupport and said001 in a direction at right angles to the direction of support movement,and meansdor retracting said work out of broaching position before saidsupport moves in the opposite direction.

6. A surface broaching machine, comprising means for retaining abroaching tool in a'stationary position, a movable 'work support, powermeans for reciprocating said support longitudinally of said tool, meansfor retaining work upon said support in position to be broached by saidtool during movement of said support in one dimeans for retaining abroaching tool in a stationary position, a movable work support forcarrying the work to be broached by said tool during movement of saidsupport in one direc-- tion, P wer means arranged alongside and par-'allel to said tool for reciprocating said support longitudinally ofsaid tool, means for retaining a piece of work upon said support andfixing it against movement relative thereto during broaching, said workwhen being broached exerting a thrust against said tool transverse tothe direction of support movement and thereby tending to cause relativedisplacement of said tool and said support, and means carried by saidsupport for taking said thrust to thereby prevent said relativedisplacement. v

8. A surface broaching machine, comprising means for retaining a surfacebroaching tool in a stationary position, a movable support for carryinga piece of work in engagement with said tool, power means forreciprocating said support longitudinally of said tool, aguide carriedby said work support and contacting said tool at a point substantiallyopposite the part of said tool in engagement with the work when saidtool is operating upon. the work for preventing said tool from beingdeflected by engagement with the work, and means for retaining a pieceof work upon said support in position to be broached by said tool duringmovement of said support in one direction.

9. A surface broaching machine, comprising means for retaining a surfacebroaching tool in a stationary position, a movable support for carryinga piece of work, power means for reciprocating said supportlongitudinally of said tool, a

guide carried by said work support in contact with said tool forpreventing said tool from being deflected by engagement with the work,means for retaining a piece of work upon said support in position to bebroached by said tool during movement of said support in one direction,and means for operating said retaining means to release said work frompositive engagement with said tool during movement .of said support inthe opposite direction.

10. A surface broaching machine, comprising means for retaining a.surface broaching tool in a stationary position, a movable support forcarrying a piece of work, 'power means arran'ged alongside said tool andconnected to said support for reciprocating it longitudinally of saidtool, a guide carried by said work support in contact with said tool forpreventing said tool from being deflected by engagement with the work,means for retaining a piece. of work upon said support in position to bebroached by said tool during movement of said support in one direction,and means responsive to said support approaching the limit of itsmovement in said direction for operating said retaining means to releasesaid work from positive engagement with said tool during movement ofsaid support in the opposite direction.

11. A surface broaching machine, comprising means for retaining abroaching tool in a stationary position, a movable work support forcarrying the work to be broached by said tool during movement of saidsupport in one direction, two hydraulic motors arranged upon oppositesides of said tool and alongside the same for reciprocating said supportlongitudinally of said tool, means for retaining a piece of work uponsaid support and fixing it against movement relative thereto duringbroaching, said work when being broached exerting a thrust against saidtool transverse to the direction of support movement and thereby tendingto cause relative displacement of said tool andsaid support, and meanscarried by said support for taking said thrust to thereby prevent saidrelative displacement.

12. A surface broaching machine, comprising means for retaining abroaching tool in a stationary position, a movable work support forcarrying the work to be broached by said tool during movement of saidsupport in one direction, power means for reciprocating said supportlongitudinally of said tool, a work holder arranged upon said supportfor carrying the work and operable to positively fix the work againstmovement relative to said support during broaching, said work when beingbroached exerting a thrust against said tool transverse to the directionof support movement and thereby tending to cause relative displacementof said tool and said support, means carried by said support for takingsaid thrust to thereby prevent said relative displacement, and meansresponsive to said support approaching the limit of its movement in eachdirection for operating said work holder to move said work toward andfrom said tool.

13. A surface broaching machine, comprising means for retaining asurface broaching tool in a stationary position, a movable work support,power means for reciprocating said support longitudinally of said tool,a work holder arranged upon said work support for carrying a piece ofwork and having a wedge-bar for moving the work, and a stationary stopfor engaging said wedge-bar near each limit of the work support movementto operate said work holder during continued movement of said worksupport.

14. A surface broaching machine, comprising means for retaining asurface broaching tool in a stationary position, a movable work support,power means for reciprocating said support longitudinally of said tool,a work holder arranged upon said work support for carrying a piece ofwork, a hydraulic motor for operating said work holder 'to move the worktoward and from said tool, and means for energizing said motor near eachlimit of the work support movement.

15. A surface broaching machine, comprising means for retaining abroaching tool in a stationary position, a movable work support forcarrying the work to be broached by said tool during movement of saidsupport in one direction, power means for reciprocating said supportlongitudinally of said tool, a work holder arranged upon said supportfor carrying the work and operable to positively fix the work againstmovement relative to said support during broaching, said work when beingbroached exerting a thrust against said tool transverse to the directionof support. movement and thereby tending to cause relative displacementof said tool and said support, means carried by said support for takingsaid thrust to thereby prevent said relative displacement, a hydraulicmotor for operating said work holder to move the work toward and fromsaid tool, and

means for energizing said motor near each limit of the work supportmovement.

16. A surface broaching. machine, comprising means for retaining asurface broaching tool in a stationary position, a movable work support,power means for reciprocating said support longitudinally of said tool,a work holder arranged upon said work support for carrying a piece ofwork, a hydraulic motor arranged in a stationary position and connectedthrough intervening mechanism to said work holder to operate the sameand thereby move the work toward and from said tool, and means forenergizing said motor near each limit of the work support movement.

17. A surface broaching machine, comprising means for retaining asurface broaching tool in a stationary position, a movable work support,

hydraulic power means for reciprocating said work support longitudinallyof said tool, a work holder arranged upon said work support for carryinga piece of work, a hydraulic motor for operating said work holdertormove the work toward and from said tool, and means for energizingsaid motor and said power means to cause the same to operate in apredetermined sequence.

18. A surface broaching machine. comprising means for retaining abroaching tool in a stationary position, a movable work support forcarrying the work to be broached by said tool during movement of saidsupport in one direction, hydraulic power means for reciprocating saidwork support longitudinally of said tool, a work holder arranged uponsaid support for carrying the work and operable to positively fix thework against movement relative to said support during broaching, a,hydraulic motor for operating said work holder to move the work towardand from said tool, and means for energizing said motor and said powermeans to cause the same to operate in a predetermined sequence.

19. A surface broaching machine, comprising means for retaining asurface broaching tool in a stationary position, a movable work support,

two hydraulic motors arranged upon opposite sides of said tool andalongside the same for reciprocating said work support longitudinally ofsaid tool, a work holder arranged uponsaid work support for carrying apiece of work, a hydraulic motor for operating said work holder to movethe work toward and from said tool, and means for causing said motors tooperate said work support and said work holder in a predeterminedsequence.

20. A surface broaching machine, comprising means for retaining asurface broaching tool in a stationary position, a movable work support,power means for reciprocating said support lonitudinally of said tool, awork holder arranged upon said work support for carrying a piece ofwork, a hydraulic motor arranged upon said work support for operatingsaid work holder to move the work toward and from said tool, and meansfor energizing said motor near each limit of the work support movement.

21. A surface broaching machine, comprising means for retaining asurface broaching tool in a stationary position, a movable work support,hydraulic power means for reciprocating said work support longitudinallyof said tool, a work holder arranged upon said work support for carryinga piece of work, a hydraulic motor arranged upon said work support foroperating said work holder to move the work toward and from said tool,and means for energizing said motor and said power means to cause thesame to operate in a predemotor and said power means to cause the sameto operate in a predetermined sequence.

23. A surface broaching machine, comprising means for retaining abroaching tool in a stationary position, a movable work support forcarof said tool and said support, and a guide fixed to said work supportin contact with the back of said tool to slide thereon during supportmovement and providing a reaction to said thrust and, thereby preventingsaid relative displacement.

24. A surface broaching machine, comprising a frame having an elongatedbroach support, a broaching tool fastened to said broach support andsupported thereby throughout its entire effective length, a movable worksupport for carrying the work to be broached by said tool dur-- ingmovement of said work support in one direction, power means forreciprocating said work support longitudinally of said tool, means forretaining a piece of work upon said work support and fixing it againstmovement relative thereto during broaching, said work when beingbroached exerting a thrust against said tool transverse to the directionof support movement and thereby tending to cause relative displace--ment of said tool and said work support, and

abutment means carried by said work support and engaging said broachsupport behind said tool to take said thrust and thereby prevent saidrelative displacement.

25. A surface broaching machine, comprising a frame having an elongatedbroach support, a broaching tool fastened to said broach support ,andsupported thereby throughout its entire efiective length, a movable worksupport for carrying the work to be broached by said tool duringmovement of said work support in one direction, power means forreciprocating said work support longitudinally of said tool, means forretaining a piece of work upon said work support and fixing it againstmovement relative thereto during breaching, said work when beingbroached exerting a thrust against said tool transverse to the directionof support movement and thereby tending to cause relative displacementof said tool and said work support, abutment means carried by said worksupport and engaging said broach support behind said. tool to take saidthrust and thereby prevent said relative displacement, and'meansresponsive to said support approaching the limit of its movement in saiddirection for operating said retaining means to release said work frompositive engagement with said tool during movement of said support inthe opposite direction.

26. A surface broaching machine, comprising a frame having an elongatedbroach support, a broaching tool fastened to said broach support andsupported thereby throughout its entire effective length, a movable worksupport for carrying the work to be broached by said tool duringmovement of said work support in one direction, power means forreciprocating said work support longitudinally ofsaid tool, means forretaining a piece of work upon said work support and fixing it againstmovement relative thereto during breaching, said work when beingbroached exerting a thrust against 'said tool transverse to thedirection of support movement and thereby tending to cause relativedisplacement of said tool and'said work support, abutment means carriedby said work support and engaging said broach support behind said toolto take said thrust and thereby prevent said relative displacement, andmeans responsive to said support approaching the limit of its movementin said direction for retractingthe work outof broaching position,

27. A surface broaching machine, comprising a frame having an elongatedbroach support, a broaching tool fastened to said broach' support andsupported thereby throughout its entire eifective length, a movable worksupport for carrying the work to be broached by said tool duringmovement of said work support in one direction, hydraulic power meansarranged alongside said broach support'for reciprocating said worksupport longitudinally of said tool, means for retaining a piece of workupon said work support and fixing it against movement relative theretoduring broaching, said work when being broached exerting a thrustagainst said tool transverse to the direction of support movement andthereby tending to cause relative displacement of said tool and saidwork support, abutment means carried by said work support and engagingsaid broach support behind said tool to take said thrust and therebyprevent said relative displacement. V

28. A surface broaching machine, comprising a frame having an elongatedbroach support, a

broaching tool fastened to saidbroach support and supported therebythroughout itsentire effective length, a movable work support forcarrying the work tobe broached by said tool during movement of saidwork support inone direction, two reciprocating hydraulic motorsarranged parallel to said broach support upon ppposite sides thereof forreciprocating said work support longitudinally of said tool, means forretaining a piece of work upon said work support and fixing it againstmovement relative'thereto during breaching, said work when beingbroached exerting a thrust against said tool transverse to the directionof support movement and thereby tending to cause relative displacementof said tool and said work support, and abutment means carried by saidwork support and engaging said broach support behind said tool to takesaid thrust and thereby prevent said relative displacement.

29. A surface broaching machine, comprising a frame having an elongatedbroach support, a breaching tool fastened to said broach support andsupported thereby throughout its entire effective vlength, a, movablework support for carrying the work to be broached by said tool duringmovement of said work support inone direction, power means forreciprocating said work support longitudinally of saidtool, means forretaining a piece of work upon said work support and fixing it againstmovement relative thereto during broaching, said Work when beingbroached exerting a thrust against said tool transverse to the directionof support movement and thereby tending to cause relative displacementof said tool and said work support, and a reaction member extendingbehind said tool from each side thereof into contact with said broachsupport to take said thrust and thereby prevent said relativedisplacement.

30. A surface broaching machine, comprising a frame having an elongatedbroach support, a

broaching tool formed of a plurality of sections 76 5 direction, powermeans for reciprocating said work support longitudinally of said tool,means for retaining a piece of work upon said worksupport and fixing itagainst movement relative thereto during breaching, said work when beingbroached exerting a. thrust against said tool transverse to thedirection of support movement and thereby tending to cause relativedisplacement of said tool and said work support, and abutment meanscarried by said work support and engaging said broach support behindsaid tool to take said thrust and thereby prevent said relativedisplacement.

WALTER FERRIS.

CERTIFICATE 01' OOHRICTIOK- December 22, 1936.

Patent No. 2,065,219-

WAltol' T91115- It is haroby certified that error appears in the abovenumbered patent requirtug correction as follows: The Gratings, Sheets 9,10, and. 11, containing Figures 20, 21, and. 22, an shown below shouldin lnlortod no part of the Letters Patent. In the heading to the dmmgo,Shanta 1, 2, 3, 4, 5, 6, 7, m4 8 relpocflvely, lino 3, for "8 Santa"road 11 Shawn.

Dec. 22, 1936.

W. FERRIS BROACHING MACHINE Original Filed Feb. '9; 1934 11 Sheets-Sheet9 INVENTOR WALTER FERRIS.

RNEY-

